As usual, there are at least two different versions of the alleged route
of the Russian bomber over Turkey. The Russian one says that the bomber
didn't violate Turkish airspace and the Turkish one says they did.
Russian version, see url: http://www.theguardian.com/world/live/2015/nov/24/russian-jet-downed-by-turkish-planes-near-syrian-border-live-updates
Turkish version, see url; http://www.independent.co.uk/news/world/middle-east/russian-defence-ministry-confirms-turkey-shot-down-its-jet-but-claims-no-air-space-violation-a6746276.html
However, looking at the Turkish version, the bomber was actually shot down outside of Turkish borders, after the alleged violation of Turkish (NATO) airspace. It's remains and the pilots landed outside of Turkey. Photos/videos show a dead Russian pilot who was caught/found by Freedom Fighters/Terrorists, who were shouting "Allahu Akbar" and were smiling and happy. And a Russian helicopter which came looking for the pilots was blown up on the ground by an American weapon which was fired by a "freedom fighter/terrorist". Where did they get the money and weapons from....well, there you are...a great mystery.
As far as invading the airspace of a nation state, the airforces and navies of the world do it all the time, conduct war exercises, testing and checking out other nation states defences and reactions. Nuffink new in that...one just doesn't get to hear about it all that often, only when a major incident occurs. What's the difference between legal terrorism and illegal terrorism...not a lot in my view...but there you are, I am always getting it wrong...
All this bombing and fighting is one of the main reasons that the migrants are coming to Europe, to seek shelter and get away from war and terrorism, in my view. And, it can only get worse, the worse the bombing gets. The terrorist organisations of course, will use any method and means they can to get their terrorists into Europe, hiding their people amongst the migrants. And, they will attack the easiest targets, not bothering much about who is killed or maimed. One nations terrorist is another nations liberation fighter. Always support the lesser of two evils. i.e. It is better to support, fund and manage Al quaeda than ISIS. Al Quaeda can be dealt with later. Ooops! Wasn't that the very US foreign policy which was in action when 9/11 happened? Afghanistan and the Russian invasion and US and UK support for the Al Quaeda liberation fighters?